function toggle_visibility(id) {
var thelist = document.getElementsByClassName("alist");
	for (var i = 0; i < thelist.length; i++) {
		thelist[i].style.display = 'none';
	}
	var e = document.getElementById(id);
	if(e.style.display == 'block') {
		e.style.display = 'none';
	} else {
		e.style.display = 'block';
	}
}

